—We have decided to go for a picnic tomorrow , Dick . Are you going with us ?
—Well , you are going , so will I .
| A．when | B．since | C．if | D．while |
Only when I left my parents for Italy ________ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
The experiment shows that proper amounts of exercise, if _______ regularly, can improve our health.
| A．being carried out | B．carried out | C．carrying out | D．to carry out |
When I opened the door, I found my father sitting in his chair, completely ______ in the humorous stories he was reading.
| A．absorbed | B．losing | C．attracted | D．addicted |
______ money, his parents couldn’t send him to university.
| A．Lacked | B．Lacking of | C．Lacked in | D．Lacking |
It’s very dangerous to _______ these viruses without any protection.
| A．be exposed to | B．expose to | C．expose | D．be exposing to |